outgoing email SMTP ip address

outgoing email SMTP ip address

I recently installed clustered exchange server, everything is working great 
with the exception of the SMTP server.  We can receive emails, but there is a 
slight problem with sending emails, it seems that when sending emails the 
cluster is not using the specified SMTP virtual ip address, but it's using 
the server's NIC's ip address.  Has anybody experienced that?  
thanks.

date: Tue, 5 Jul 2005 09:51:04 -0700 author: Dominik

Re: outgoing email SMTP ip address

Hi,

This is normal behaviour and it can't be changed.

Leif

"Dominik"  skrev i en meddelelse
news:6865FD20-2B9B-4F28-9BD8-25B7FD863DB2@microsoft.com...
> I recently installed clustered exchange server, everything is working
great
> with the exception of the SMTP server.  We can receive emails, but there
is a
> slight problem with sending emails, it seems that when sending emails the
> cluster is not using the specified SMTP virtual ip address, but it's using
> the server's NIC's ip address.  Has anybody experienced that?
> thanks.

date: Tue, 5 Jul 2005 19:27:16 +0200 author: Leif Pedersen [MVP]

Re: outgoing email SMTP ip address

hmmm... that is interesting, maybe you can recommend a solution,
the problem is that some domains do a reverse dns lookup when receiving 
emails, due to spam and such.  So when we send them emails they reject them 
becaue the ip address that our server is using does not match the dns/reverse 
dns entries.
The firewall that we're using right now only allows for a one-to-one nat, 
and there is no option for a one-to-many.

thanks

Dominik

"Leif Pedersen [MVP]" wrote:

> Hi,
> 
> This is normal behaviour and it can't be changed.
> 
> Leif
> 
> "Dominik"  skrev i en meddelelse
> news:6865FD20-2B9B-4F28-9BD8-25B7FD863DB2@microsoft.com...
> > I recently installed clustered exchange server, everything is working
> great
> > with the exception of the SMTP server.  We can receive emails, but there
> is a
> > slight problem with sending emails, it seems that when sending emails the
> > cluster is not using the specified SMTP virtual ip address, but it's using
> > the server's NIC's ip address.  Has anybody experienced that?
> > thanks.
> 
> 
>

date: Tue, 5 Jul 2005 10:51:01 -0700 author: Dominik

Re: outgoing email SMTP ip address

"Dominik"  wrote in message 
news:0D0D49BF-D0B7-4A95-B1D6-AB971CB2C837@microsoft.com...
> hmmm... that is interesting, maybe you can recommend a solution,
> the problem is that some domains do a reverse dns lookup when receiving
> emails, due to spam and such.  So when we send them emails they reject 
> them
> becaue the ip address that our server is using does not match the 
> dns/reverse
> dns entries.
> The firewall that we're using right now only allows for a one-to-one nat,
> and there is no option for a one-to-many.
>> This is normal behaviour and it can't be changed.
>>
>> "Dominik"  skrev i en meddelelse
>> news:6865FD20-2B9B-4F28-9BD8-25B7FD863DB2@microsoft.com...
>> > I recently installed clustered exchange server, everything is working
>> great
>> > with the exception of the SMTP server.  We can receive emails, but 
>> > there
>> is a
>> > slight problem with sending emails, it seems that when sending emails 
>> > the
>> > cluster is not using the specified SMTP virtual ip address, but it's 
>> > using
>> > the server's NIC's ip address.  Has anybody experienced that?
>> > thanks.

Put in the additional reverse zone entries.

date: Tue, 5 Jul 2005 11:58:55 -0600 author: Russ Kaufmann

Re: outgoing email SMTP ip address

A front-end/back-end scenario is recommended.  The cluster will send the 
mail to the front-end, who can forward it to the rest of the world.

-- 
Bob Christian II
http://blogspot.bobchristian.com  - Blog



"Dominik"  wrote in message 
news:0D0D49BF-D0B7-4A95-B1D6-AB971CB2C837@microsoft.com...
> hmmm... that is interesting, maybe you can recommend a solution,
> the problem is that some domains do a reverse dns lookup when receiving
> emails, due to spam and such.  So when we send them emails they reject 
> them
> becaue the ip address that our server is using does not match the 
> dns/reverse
> dns entries.
> The firewall that we're using right now only allows for a one-to-one nat,
> and there is no option for a one-to-many.
>
> thanks
>
> Dominik
>
> "Leif Pedersen [MVP]" wrote:
>
>> Hi,
>>
>> This is normal behaviour and it can't be changed.
>>
>> Leif
>>
>> "Dominik"  skrev i en meddelelse
>> news:6865FD20-2B9B-4F28-9BD8-25B7FD863DB2@microsoft.com...
>> > I recently installed clustered exchange server, everything is working
>> great
>> > with the exception of the SMTP server.  We can receive emails, but 
>> > there
>> is a
>> > slight problem with sending emails, it seems that when sending emails 
>> > the
>> > cluster is not using the specified SMTP virtual ip address, but it's 
>> > using
>> > the server's NIC's ip address.  Has anybody experienced that?
>> > thanks.
>>
>>
>>

date: Mon, 11 Jul 2005 02:15:17 -0400 author: Bob Christian

Re: outgoing email SMTP ip address

If you are using private addressing and NAT, then this should not be an 
issue.  Just make sure that you have a reverse dns entry for the natted 
sending address in your external dns zone.


"Bob Christian"  wrote in message 
news:ezyJX$dhFHA.4000@TK2MSFTNGP12.phx.gbl...
>A front-end/back-end scenario is recommended.  The cluster will send the 
>mail to the front-end, who can forward it to the rest of the world.
>
> -- 
> Bob Christian II
> http://blogspot.bobchristian.com  - Blog
>
>
>
> "Dominik"  wrote in message 
> news:0D0D49BF-D0B7-4A95-B1D6-AB971CB2C837@microsoft.com...
>> hmmm... that is interesting, maybe you can recommend a solution,
>> the problem is that some domains do a reverse dns lookup when receiving
>> emails, due to spam and such.  So when we send them emails they reject 
>> them
>> becaue the ip address that our server is using does not match the 
>> dns/reverse
>> dns entries.
>> The firewall that we're using right now only allows for a one-to-one nat,
>> and there is no option for a one-to-many.
>>
>> thanks
>>
>> Dominik
>>
>> "Leif Pedersen [MVP]" wrote:
>>
>>> Hi,
>>>
>>> This is normal behaviour and it can't be changed.
>>>
>>> Leif
>>>
>>> "Dominik"  skrev i en meddelelse
>>> news:6865FD20-2B9B-4F28-9BD8-25B7FD863DB2@microsoft.com...
>>> > I recently installed clustered exchange server, everything is working
>>> great
>>> > with the exception of the SMTP server.  We can receive emails, but 
>>> > there
>>> is a
>>> > slight problem with sending emails, it seems that when sending emails 
>>> > the
>>> > cluster is not using the specified SMTP virtual ip address, but it's 
>>> > using
>>> > the server's NIC's ip address.  Has anybody experienced that?
>>> > thanks.
>>>
>>>
>>>
>
>

date: Mon, 29 Aug 2005 12:05:19 -0700 author: SMR

Re: outgoing email SMTP ip address

"SMR"  wrote in message 
news:ekChdyMrFHA.2896@TK2MSFTNGP10.phx.gbl...
> If you are using private addressing and NAT, then this should not be an 
> issue.  Just make sure that you have a reverse dns entry for the natted 
> sending address in your external dns zone.

Just as a side note, very few organizations use reverse-DNS to test each and 
every received message because of its overhead. For those that are really on 
the cutting edge, they will likely implement some form of Sender-ID, in 
which case, it is very important to have sender-ID records to keep email 
from potentially being treated as SPAM.

http://msmvps.com/clusterhelp/archive/2005/08/05/61726.aspx has some 
information about Sender ID if you are interested.


-- 
Russ Kaufmann

MVP - Windows Server - Clustering
http://www.clusterhelp.com - Cluster Website
http://msmvps.com/clusterhelp - New Blog
http://spaces.msn.com/members/russkaufmann - Old Blog

date: Mon, 29 Aug 2005 16:05:12 -0600 author: Russ Kaufmann [MVP]

Re: outgoing email SMTP ip address

Exactly.

We use reciepient verification via LDAP and AD to verify every incoming 
email address, before it is ever accepted at the relay level.

-Scott


"Russ Kaufmann [MVP]"  wrote in message 
news:OhoD7WOrFHA.3356@TK2MSFTNGP10.phx.gbl...
> "SMR"  wrote in message 
> news:ekChdyMrFHA.2896@TK2MSFTNGP10.phx.gbl...
>> If you are using private addressing and NAT, then this should not be an 
>> issue.  Just make sure that you have a reverse dns entry for the natted 
>> sending address in your external dns zone.
>
> Just as a side note, very few organizations use reverse-DNS to test each 
> and every received message because of its overhead. For those that are 
> really on the cutting edge, they will likely implement some form of 
> Sender-ID, in which case, it is very important to have sender-ID records 
> to keep email from potentially being treated as SPAM.
>
> http://msmvps.com/clusterhelp/archive/2005/08/05/61726.aspx has some 
> information about Sender ID if you are interested.
>
>
> -- 
> Russ Kaufmann
>
> MVP - Windows Server - Clustering
> http://www.clusterhelp.com - Cluster Website
> http://msmvps.com/clusterhelp - New Blog
> http://spaces.msn.com/members/russkaufmann - Old Blog
>

date: Tue, 30 Aug 2005 09:44:11 -0700 author: SMR

Re: outgoing email SMTP ip address

If you make accept vs. reject decisions at that level in such a way that the 
sender can tell "who is a real mailbox", I hope you're tarpitting!

-- 
Evan Dodds
Program Manager
Microsoft Exchange Server

****** Disclaimer ******
This posting is provided "AS IS" with no warranties, and confers no rights.
Note: Please do not reply to this e-mail address. It is used for newsgroup 
purposes only.

"SMR"  wrote in message 
news:ePaVNIYrFHA.2212@TK2MSFTNGP15.phx.gbl...
> Exactly.
>
> We use reciepient verification via LDAP and AD to verify every incoming 
> email address, before it is ever accepted at the relay level.
>
> -Scott
>
>
> "Russ Kaufmann [MVP]"  wrote in message 
> news:OhoD7WOrFHA.3356@TK2MSFTNGP10.phx.gbl...
>> "SMR"  wrote in message 
>> news:ekChdyMrFHA.2896@TK2MSFTNGP10.phx.gbl...
>>> If you are using private addressing and NAT, then this should not be an 
>>> issue.  Just make sure that you have a reverse dns entry for the natted 
>>> sending address in your external dns zone.
>>
>> Just as a side note, very few organizations use reverse-DNS to test each 
>> and every received message because of its overhead. For those that are 
>> really on the cutting edge, they will likely implement some form of 
>> Sender-ID, in which case, it is very important to have sender-ID records 
>> to keep email from potentially being treated as SPAM.
>>
>> http://msmvps.com/clusterhelp/archive/2005/08/05/61726.aspx has some 
>> information about Sender ID if you are interested.
>>
>>
>> -- 
>> Russ Kaufmann
>>
>> MVP - Windows Server - Clustering
>> http://www.clusterhelp.com - Cluster Website
>> http://msmvps.com/clusterhelp - New Blog
>> http://spaces.msn.com/members/russkaufmann - Old Blog
>>
>
>

date: Tue, 30 Aug 2005 14:37:12 -0700 author: Evan Dodds [MSFT]